MI5 Director General Parker also slammed the Kremlin for “flagrant breaches of international rules” in his first public speech since the March outrage - warning Russia that it faces becoming a pariah over the Salisbury poison plot.

British investigators believe Novichok was used to poison Russian double agent Sergei Skripal and his daughter Yulia

THWARTED: Twelve terror attacks foiled in a year since Westminster Bridge atrocity

TWELVE devastating terror attacks have been foiled in the year after the Westminster Bridge atrocity.

Security services managed to thwart the plots that were expected to target tourist attractions, pop concerts and government buildings.

Disrupted plots, some at the hands of ISIS, were also planned to use knives and cars to target crowds.

MI5 director general Andrew Parker is also expected to reveal the extent of the work done by security services, with spies in Berlin stopping 25 attacks on UK soil since the murder of Lee Rigby in 2013.

He is expected to say that he is "confident about our ability to tackle these threats, because of the strength and resilience of our democratic systems, the resilience of our societies and the values we share with our European partners."

Mr Parker, who said he once studied Russian, accused Moscow of attempting to subvert Western democracies by sowing disinformation and spreading lies.

He said: "Instead of becoming a respected great nation it risks becoming a more isolated pariah.

"The Russian state's now well-practised doctrine of blending media manipulation, social media disinformation and distortion along with new and old forms of espionage, and high-levels of cyber attacks, military force and criminal thuggery is what is meant these days by the term hybrid threats."

Despite the ever-growing complexity of ISIS plots, Mr Parker revealed 12 UK terror plots have been foiled since the 2017 Westminster attack, and 25 since 2013.

And he warned ISIS remains a huge threat despite being almost driven out of Iraq and Syria.

But he revealed intelligence sharing between countries is helping combat extremists.

Adding that despite Brexit a strong security partnership between Britain and Europe is vital and “in today’s uncertain world we need that shared strength more than ever”.

Mr Parker stated that European intelligence co-operation today is “simply unrecognisable to what it looked like five years ago” and that there is real-time intelligence-sharing including “thousands of exchanges on advanced secure networks every week”.

Former Russian double agent Sergei Skripal, 66, and his daughter Yulia, 33, were poisoned with the nerve agent after it was smeared on the front door of their Wiltshire home.

The pair were rushed to Salisbury District Hospital in critical condition after being found slumped on a bench in a park.

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